Incorrect oil filter without anti-drainback feature

Install the correct oil filter.

Incorrect oil viscosity

1. Drain the oil.
2. Install the correct viscosity oil.

High valve lifter leak down rate

Replace the lifters, as required.

Worn crankshaft thrust bearing

1. Inspect the crankshaft end play.
2. Inspect the thrust bearing and crankshaft.
3. Repair or replace, as required.

Faulty oil filter bypass valve

The bypass valve is now internal to the oil filter.

Replace the filter, as required.